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(x+77)/2=70
We move all terms to the left:
(x+77)/2-(70)=0
We multiply all the terms by the denominator
(x+77)-70*2=0
We add all the numbers together, and all the variables
(x+77)-140=0
We get rid of parentheses
x+77-140=0
We add all the numbers together, and all the variables
x-63=0
We move all terms containing x to the left, all other terms to the right
x=63
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